So I should re-jet it?Originally Posted by camchain
L-Plate Rider
So I should re-jet it?
Hardcore Biker
You certainly don't have to, but mods like these potentiate each other. Having spent a fair bit on a new exhaust system it's worth the bit extra to tweak the carb as engine will be breathing a lot better. BTW make sure you remove the airbox lid otherwise might as well leave the new pipe in the box.
The stock KLX300 muffler is really not that restrictive (it's just heavy), the real prob is header pipe which is just too small in diameter (stock header is from earlier model KLX250, 300 is bored out 250). The exhaust port on the 300 is larger then the stock header, you'll see it's quite a big size step down from port to pipe.
KLX carb is a CV (diaphram) job, good for emissions/economy but not performance. Note your throttle cable is not attached to the carb slide, it operates a butterfly valve in carb throat, then engine suck causes diaphram pressure differential which then lifts the slide = slow throttle response.
Apparently they really come to life with a new carb but it's a bit of a major (usually frame mods involved). Dynojet kit works pretty well and very simple to fit. You don't get many parts for your $100 but the result is worth it (Kit has much better needle which has sharper stepped taper, different shape main jet to suit needle, and a drill bit to open up the slide lift hole under diaphram). I felt the kit gave a similar boost again on top of new exhaust system, so = good value. Carb kit gave no extra top end power but better throttle response and boost to bottom end. I only wished I'd done the carb kit straight away.
L-Plate Rider
Thanks camchain, that's what I needed to know(there's a big bore header coming with the exhaust) so this dynojet kit, do I just get that a Kawasaki dealership? or is that something I'd get online somewhere?
Hardcore Biker
Glad to help if I can. I got mine from AMPS in Newmarket (Think I Googled Dynojet and they came up) but maybe your local kwaka dealer can get one in for you. From memory instructions re setup were a bit vague but you can't go too far wrong, play with needle clip position for best result. I'd fit the pipe first, go for a squirt up the street just before doing carb so you can feel the difference.
Forum whore
try these guys http://www.thequadshop.co.nz/ they have heaps of hot up parts for klX300's including bigbore pistons kits etc...carbs the works!!Thanks camchain, that's what I needed to know
L-Plate Rider
Hey thanks for that cowpoos! I'll check it out when the sites back up (down for maintenance)
Fitted the new header and exhaust today, turns out the old header was only held on by one nut which was barely finger tight, the other had riggled off I presume... Anywho, the new one's on and certainly adds more top end power!
L-Plate Rider
Nice. Just got a klx250 (a month ago) with some adventure tyres on it now. Have not had any issues starting it and it's a 1994 (13,000kms). Third kick max on a cold morning and usually first pop when hot. Can't get enough of it!
L-Plate Rider
Nice one. Yeah I find it kind funny, for a four-stroke, how it takes more kicks when it's cold than when it's hot! my brother has a husky tc450, and when that thing gets hot it's a prick to start, he stalled it going through a stream one day and it took him about 5 mins to get it going again, good times, good times :P
L-Plate Rider
The thing about these KLX300's that really surprises me is that sometimes I'll be simply kicking it slowly to get to TDC with the weight of my leg, and the bloody thing just starts! Amazing, and I've owned a lot of big 4 strokes (tt600, xt550, xt500, xl350 etc) back in the old days.. Never had anything that starts quite so easy. Good thing is, it will grunt up the sort of hill where you've had to change direction quickly and are faced with a real steep bit.. she'll just grunt on over it no worries.. Good bike.
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